Brodix 18X heads???

[63corvette]

I would look at the carb and check your valve springs.
If I noticed my 434 getting a little lazy I would look at the valve springs and usually they were a little weak.
When I tried to run the 950 carb my 434 would not hardly get to 7000 RPM.
My 2 Cents

[R&S Motorsports]

Well arrived at the PRI show today I will be talking to all of the manufactures and will post some results next week sometime, as far a carb I run a 1435 terminator with a O 1/2 pump on my small 396 which is very consistant and I was told that with the new combo and bigger heads that I may need the 2100 CFM model guess you can never have enough air the motor it will only use what it can take. When I was told that I needed the 1435 for the 396 I thought that the guy was nuts I figured that it was way to big for my combo but was way wrong when the car picked up almost 2 tenths and became much more consistant from a good 850 methanol carb.

[rod butcher]

Bob I sent you a pm
rod

[sst3447]

I have a 434 with a set of Brodix 18c heads that are cnc machined and they are spreadport, titanium valves and t&d shaft rockers, 704 lift cam 14-1 compression with a 1050 carb with a dart block . It made 757 hp @ 7000rpm ,on the stop it goes 10.90 @140 in a 2950 lb car it was a big improvement over my 23 degree heads i had before when it went 10.90 @ 130with the same cubic inches was told i was undercamed my the machine shop it needs about 800 lift and would be over 800hp if i would change it but this combo is very consistant i would recommend Brodix and 18 degree heads to anyone that asks

[Jason Oldfield]

Originally Posted by 63corvette

I would look at the carb and check your valve springs.
If I noticed my 434 getting a little lazy I would look at the valve springs and usually they were a little weak.
When I tried to run the 950 carb my 434 would not hardly get to 7000 RPM.
My 2 Cents

I picked up 30 hp on the dyno by increasing the size of my Race Demon RS from an 825 cfm version to 975 cfm. Every simulation I have run has shown that I should run as big of a carb as possible on my 383. This motor made 630 hp with a 4-7 swap cam and AFR 210 CNC ported heads. Nothing really exotic. I go through the traps at 7800 rpm.